From: Jan Kara <jack@suse.cz>
To: Christoph Hellwig <hch@infradead.org>
Cc: Jan Kara <jack@suse.cz>, LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 1/3] bdi: Use parent filesystem BDI for inodes not capable of writeback
Date: Tue, 27 Jul 2010 20:01:31 +0200 [thread overview]
Message-ID: <20100727180131.GG6820@quack.suse.cz> (raw)
In-Reply-To: <20100727172731.GA25727@infradead.org>
On Tue 27-07-10 13:27:31, Christoph Hellwig wrote:
> On Tue, Jul 27, 2010 at 07:24:38PM +0200, Jan Kara wrote:
> > Always returning inode->i_sb->s_bdi wouldn't be a right thing IMHO.
> > That would file inode for /dev/sda to BDI list of tmpfs mounted on /dev/
> > which isn't what you want...
>
> It shouldn't. Block device nodes are on the bdev filesystems, and
Ok, so inode->i_sb->s_bdi will actually point to noop_backing_dev_info
as set by set_anon_super(). Or am I completely out?
> we twist the file->mapping pointer so that all the low-level read/write
> code always deals with the bdev fs inode, and not the device node
> filesystem.
Yes, I know this but I fail to see how this influences where </dev/sda's
inode>->i_sb->s_bdi ends up...
Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
next prev parent reply other threads:[~2010-07-27 18:01 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-27 17:04 [PATCH 0/3] Fix warnings in __mark_inode_dirty Jan Kara
2010-07-27 17:04 ` [PATCH 1/3] bdi: Use parent filesystem BDI for inodes not capable of writeback Jan Kara
2010-07-27 17:09 ` Christoph Hellwig
2010-07-27 17:24 ` Jan Kara
2010-07-27 17:27 ` Christoph Hellwig
2010-07-27 18:01 ` Jan Kara [this message]
2010-07-27 20:12 ` Christoph Hellwig
2010-07-27 20:21 ` Christoph Hellwig
2010-07-27 20:44 ` Jan Kara
2010-07-27 20:46 ` Christoph Hellwig
2010-07-29 8:12 ` Christoph Hellwig
2010-07-29 12:17 ` Jan Kara
2010-07-27 17:05 ` [PATCH 2/3] char: Mark /dev/zero and /dev/kmem as " Jan Kara
2010-07-27 17:05 ` [PATCH 3/3] bdi: Initialize noop_backing_dev_info properly Jan Kara
2010-07-27 17:09 ` Christoph Hellwig
2010-07-27 17:17 ` Jan Kara
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